CN111025680A

CN111025680A - Sclera lens

Info

Publication number: CN111025680A
Application number: CN201911378879.2A
Authority: CN
Inventors: 陶悦群; 付志英; 柳翠英; 陈然
Original assignee: AUTEK CHINA Inc
Current assignee: AUTEK CHINA Inc
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-04-17

Abstract

The invention discloses a scleral lens, which comprises a lens body, wherein an optical area, a transition area and a positioning area are continuously formed on the lens body from the center to the outside, the joint of a cornea and a sclera is sequentially divided into a cornea part, a transition part and a sclera part along the direction from the cornea to the sclera, the positioning area is attached to the sclera and used for positioning the scleral lens, the transition area stretches across the upper parts of the cornea and the sclera, so that the optical area is arranged at the front end of the cornea and provides vision correction for eyes, the transition area is arranged into any one of a section of arc structure, a two section of arc structure or a three section of arc structure according to the different shapes of the cornea part, the transition part and the sclera part, the comfortable feeling can be distinguished and designed according to the different shapes of the cornea part, the transition part and the sclera part, and the comfortable feeling.

Description

Sclera lens

Technical Field

The invention relates to the field of contact lenses, in particular to a scleral lens.

Background

Like many lenses, scleral lenses are also used to correct vision problems, but differ from other contact lenses in that scleral lenses can also be used to protect the cornea and have some therapeutic effect.

The scleral lens is in direct contact with the insensitive cornea, the edge of which falls on the less sensitive white eye, also known as the sclera; the scleral lens and the cornea are not in direct contact, and a layer of liquid which can protect the cornea is reserved between the scleral lens and the cornea, so that the scleral lens and the cornea can be used for helping the cornea to heal and repair.

The connecting area of the cornea and the sclera is divided into a cornea portion, a transition portion and a sclera portion in sequence along the direction from the cornea to the sclera.

The vision correction effect provided by the scleral lens is similar to the correction effect of other types of hard contact lenses, but the comfort level is higher, and the scleral lens can be completely worn in dusty, windy, dry and other severe environments.

Scleral mirror among the prior art lacks detailed design to the transition zone, can not carry out the design of adaptability according to the eyeball shape of difference, wears the comfort relatively poor.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a scleral lens, which can be designed differently according to the different shapes of the cornea portion, the transition portion, and the sclera portion, thereby improving the wearing comfort.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides a scleral mirror, includes the mirror body, the mirror body is formed with optical zone, transition region and locating area from the center outwards in succession, and the linking area of cornea and sclera divide into cornea part, transition part and sclera part along the direction of cornea to sclera in proper order, the laminating of locating area is in sclera department and be used for doing the scleral mirror location, the transition region spans the upper portion of cornea and sclera, makes optical zone set up at the cornea front end and provides vision correction for the eye, the transition region sets up to one section arc structure, two sections arc structures or the arbitrary one in the three section arc structures according to the different shapes of cornea part, transition part and sclera part.

Further, the diameter DIA of the end of the transition area_BFC＝9mm～13mm。

Further, when the cornea portion, the transition portion, and the sclera portion are all convex, or when the cornea portion, the transition portion are convex and the sclera portion is a tangent, the transition region is a segment of an arc structure, the segment of the arc structure includes a first arc,radius of curvature R of the starting end of the first arc_BFC1＝R₁Wherein R is₁Is the radius of curvature of the cornea at the position corresponding to the beginning of the first arc.

Further, the diameter DIA of the end tail end of said first arc_BFC1＝9mm～13mm。

Further, when the cornea part and the sclera part are convex surfaces and the transition part is a tangent surface, the transition area is of a two-section arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting end of the second arc line corresponds to the cornea, the starting end of the third arc line corresponds to the sclera, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂The radius of curvature of the cornea at a position corresponding to the beginning of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃The radius of curvature of the sclera at a position corresponding to the beginning of the third arc.

Further, when the cornea part is convex and the transition part and the sclera part are tangent planes, the transition area is of a two-section arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting ends of the second arc line and the third arc line correspond to the cornea, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂The radius of curvature of the cornea at a position corresponding to the beginning of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃Is the radius of curvature of the cornea at a position corresponding to the beginning of the third arc.

Further, the diameter DIA of the end tail end of said second arc_BFC29mm to 11.5 mm; diameter DIA of the end tail of said third arc_BFC39.5mm to 13mm, and DIA_BFC3＞DIA_BFC2。

Further, when the cornea part is convex, the transition part is a section and the sclera part is concave, the transition area is a three-segment arc structureThe three-segment arc structure comprises a fourth arc line, a fifth arc line and a sixth arc line which are continuously formed from the center to the outside, wherein the starting end of the fourth arc line and the starting end of the fifth arc line both correspond to the position of a cornea, the starting end of the sixth arc line corresponds to the position of a sclera, and the radius of curvature R of the starting end of the fourth arc line_BFC4＝R₄Wherein R is₄The radius of curvature of the cornea at a position corresponding to the starting end of the fourth arc; radius of curvature R of the starting end of the fifth arc_BFC5＝R₅Wherein R is₅The radius of curvature of the cornea at a position corresponding to the starting end of the fifth arc; radius of curvature R of the starting end of the sixth arc_BFC6＝R₆Wherein R is₆The radius of curvature of the sclera corresponding to the start of the sixth arc.

Further, the diameter DIA of the end tail end of said fourth arc_BFC49 mm-10 mm; diameter DIA of the end of said fifth arc_BFC59.5 mm-11.5 mm; diameter DIA of the end of said sixth arc_BFC610mm to 13mm, and DIA_BFC6＞DIA_BFC5＞DIA_BFC4。

Further, a radius of curvature R at the center of the inner surface of the optical zone_BBC＝R_corneal-ozWherein R is_corneal-ozThe radius of curvature at the center of the cornea, the diameter oz of the tail end of the optical zone is 5 mm-9 mm; radius of curvature R of the starting end of the positioning region_BAC＝R_scleral-ACWherein R is_scleral-ACThe radius of curvature of the sclera at a position corresponding to the beginning of the positioning zone, the diameter DIA of the end of said positioning zone_BAC＝12mm～17mm。

Compared with the prior art, the invention has the beneficial technical effects that:

1. the invention can be designed according to different shapes of the cornea part, the transition part and the sclera part, thereby improving the wearing comfort.

Drawings

FIG. 1 is a schematic view of the structure of the optical zone, transition zone and positioning zone of the present invention;

FIG. 2 is a schematic view of the cornea portion, transition portion, and sclera portion of the present invention all being convex;

FIG. 3 is a schematic view of the cornea portion, transition portion being convex and sclera portion being a cut-away in accordance with the present invention;

FIG. 4 is a schematic view of the cornea portion, sclera portion being convex and transition portion being a cutaway in accordance with the present invention;

FIG. 5 is a schematic view of the present invention with the corneal portion being convex and the transition portion and the sclera portion being tangential;

FIG. 6 is a schematic view of the present invention showing a convex corneal portion, a sectioned transition portion, and a concave scleral portion;

fig. 7 is a schematic diagram of the structures of the saggital height of the optical zone, the saggital height of the transition zone, and the saggital height of the positioning zone of the present invention.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-7, a scleral mirror comprises a mirror body, wherein an optical area 1, a transition area 2 and a positioning area 3 are continuously formed on the mirror body from the center to the outside, a connection area 20 of a cornea 10 and a sclera 30 is sequentially divided into a cornea part 21, a transition part 22 and a sclera part 33 along the direction from the cornea to the sclera, the positioning area 3 is attached to the sclera and is used for positioning the scleral mirror, the transition area crosses the upper parts of the cornea and the sclera, so that the optical area is arranged at the front end of the cornea 10 and provides vision correction for the eye, and the transition area 2 is arranged into any one of a section of arc structure, a two section of arc structure or a three section of arc structure according to different shapes of the cornea part 21, the transition part 22 and the sclera part 23.

Diameter DIA of the end of said transition zone 2_BFC＝9mm～13mm。

As shown in fig. 2 and 3, when the cornea portion 21, the transition portion 22 and the sclera portion 23 are all convex, or when the cornea portion 21, the transition portion 22 are convex and the sclera portion 23 is a tangent plane, the transition region 2 is a segment of arc structure, the segment of arc structure comprises a first arc line, and the curve of the starting end of the first arc lineRadius of curvature R_BFC1＝R₁Wherein R is₁Is the radius of curvature of the cornea 10 at the location corresponding to the beginning of the first arc.

Diameter DIA of the end of said first arc_BFC1＝9mm～13mm。

Rise of first arc sag_BFC1And (4) taking the rise of the sclera at the position corresponding to the tail end of the first arc line.

Due to the rise of the first arc line sag_BFC1The following equation is satisfied:

obtaining the first arc eccentricity e_BFC1Comprises the following steps:

(ii) a Wherein DIA_BFC1Is the diameter of the end of the first arc, R_BFC1Is the radius of curvature of the first arc, oz is the diameter of the end of the optical zone, sag_lens-ozIs the rise of the optical zone.

The rise, also known as sag, is the perpendicular distance between the geometric center of the back surface of the lens and the plane of the diameter of the lens; keeping the lens diameter unchanged, flattening the lens can reduce the sagittal height, and conversely, the sagittal height can be increased.

The transition zone is in a two-section arc structure and corresponds to two conditions.

As shown in fig. 4, when the cornea portion 21 and the sclera portion 23 are convex and the transition portion 22 is a section, the transition region 2 is a two-segment arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting end of the second arc line corresponds to the cornea, the starting end of the third arc line corresponds to the sclera, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂A radius of curvature of a position on the cornea 10 corresponding to the start of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃Is the radius of curvature of the sclera 30 at a location corresponding to the beginning of the third arc.

As shown in fig. 5, when the cornea portion 21 is convex and the transition portion 22 and the sclera portion 23 are tangent, the transition region 2 is a two-segment arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting ends of the second arc line and the third arc line correspond to the cornea, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂A radius of curvature of a position on the cornea 10 corresponding to the start of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃Is the radius of curvature of the cornea 10 at a position corresponding to the beginning of the third arc.

Diameter DIA of the end tail of said second arc_BFC29mm to 11.5 mm; diameter DIA of the end tail of said third arc_BFC39.5mm to 13mm, and DIA_BFC3＞DIA_BFC2。

Due to rise of the second arc sag_BFC2The following equation is satisfied:

the second arc eccentricity e can be obtained_BFC2Comprises the following steps:

due to rise of the third arc line sag_BFC3The following equation is satisfied:

the eccentricity e of the third arc can be obtained_BFC3Comprises the following steps:

wherein oz is the diameter of the end of the optical zone; rise of second arc sag_BFC2The rise is equal to the rise of the position on the eyeball corresponding to the tail end of the second arc line; rise of second arc sag_BFC3Equal to the rise of the eyeball corresponding to the tail end of the third arc line.

As shown in fig. 6, when the cornea portion 21 is convex, the transition portion 22 is a tangent plane and the sclera portion 23 is concave, the transition region 2 is a three-segment arc structure, the three-segment arc structure includes a fourth arc line, a fifth arc line and a sixth arc line which are continuously formed from the center to the outside, the starting ends of the fourth arc line and the fifth arc line correspond to the position of the cornea, the starting end of the sixth arc line corresponds to the position of the sclera, and the radius of curvature R of the starting end of the fourth arc line is_BFC4＝R₄Wherein R is₄The radius of curvature of the cornea 10 at a position corresponding to the start of the fourth arc; radius of curvature R of the starting end of the fifth arc_BFC5＝R₅Wherein R is₅The radius of curvature of the cornea 10 at a position corresponding to the start of the fifth arc; radius of curvature R of the starting end of the sixth arc_BFC6＝R₆Wherein R is₆Is the radius of curvature of the sclera 30 at a location corresponding to the beginning of the sixth arc.

Diameter DIA of the end of said fourth arc_BFC49 mm-10 mm; diameter DIA of the end of said fifth arc_BFC59.5 mm-11.5 mm; diameter DIA of the end of said sixth arc_BFC610mm to 13mm, and DIA_BFC6＞DIA_BFC5＞DIA_BFC4。

The eccentricity of the fourth arc, the fifth arc and the sixth arc is solved in the same manner as above.

As shown in fig. 1, the radius of curvature R at the center of the inner surface of the optical zone 1_BBC＝R_corneal-ozWherein R is_corneal-_ozThe diameter oz of the end of the optical zone is 5mm to 9mm, which is the radius of curvature at the center of the cornea 10.

The diameter of the tail end of the optical zone has a linear relation with the diameter of the pupil，oz＝oz₀+1mm, wherein oz₀Is the diameter of the pupil;

the cornea has a cornea optical zone with a sag height_corneal-oz。

Saggital sags of the optical zone of a scleral mirror_lens-oz＝sag_corneal-oz。

The inner surface of the optical zone is concave and has an eccentricity e_BBCComprises the following steps:

wherein oz is the diameter of the tail end of the optical zone, R_BBCIs the radius of curvature of the inner surface of the optical zone.

The outer surface of the optical area is a convex surface, and the design of the convex surface of the optical area needs to consider the diopter PW required to be corrected for the myopia or hyperopia of a patient, the material refractive index n and the central thickness t of the scleral lens, so that the curvature radius R of the convex surface of the optical area of the scleral lens can be calculated_FBC：

Wherein the value range of the central thickness t of the scleral mirror is 0.04 mm-0.60 mm.

The rise of the cornea and sclera parts, the radius of curvature of the cornea and sclera parts can all be obtained in the corneal topography of the measuring device, the refractive index n of the material, the diopter PW of the patient for near or far vision to be corrected, and the central thickness t of the scleral lens are known quantities.

As shown in FIG. 1, the radius of curvature R of the starting end of the positioning region 3_BAC＝R_scleral-ACWherein R is_scleral-ACIs the radius of curvature of the sclera 30 at a position corresponding to the beginning of the positioning zone, the diameter DIA of the end of said positioning zone_BAC＝12mm～17mm。

To solve for eccentricity e of the localization zone_BACThe rise of the transition region, sag, needs to be determined_BFCIf the transition region is a segment of an arc structure, sag_BFC＝sag_BFC1(ii) a If the transition zone is of a two-segment arc structure: sag_BFC＝sag_BFC2+sag_BFC3(ii) a If the transition zone is of a three-segment arc structure: sag_BFC＝sag_BFC4+sag_BFC5+sag_BFC6。

Due to the rise of the positioning area sag_BACThe following equation is satisfied:

the eccentricity e of the location area can be obtained_BACComprises the following steps:

(ii) a Wherein the rise of the positioning area sag_BAC＝sag_scleral-AC，sag_scleral-ACIs the rise of the sclera at the position corresponding to the tail end of the positioning area.

In the invention, the optical area, the positioning area, the transition area, the first arc line, the second arc line, the third arc line, the fourth arc line, the fifth arc line and the sixth arc line are all conical curves, and the shapes of the arc curves can be uniquely determined according to the curvature radius of each starting end and each eccentricity.

In the invention, the tail ends of the optical area, the positioning area, the transition area, the first arc line, the second arc line, the third arc line, the fourth arc line, the fifth arc line and the sixth arc line are all circular structures.

In the invention, the rise of each part of the cornea and the sclera and the curvature radius of each part of the cornea and the sclera can be obtained in the corneal topography of the measuring equipment.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A scleral lens, comprising a lens body which is continuously formed with an optical zone (1), a transition zone (2) and a positioning zone (3) from the center to the outside, wherein a connection zone (20) of a cornea (10) and a sclera (30) is sequentially divided into a cornea part (21), a transition part (22) and a sclera part (33) along the direction from the cornea to the sclera, characterized in that: the utility model discloses a vision correction device, including sclera, transition zone (2), transition zone (3), cornea and sclera, the transition zone is used for the sclera to be fixed a position, the transition zone (3) laminating is in sclera department and is used for doing the scleral mirror location, the upper portion of transition zone span cornea and sclera makes the optical zone set up at cornea (10) front end and provides vision correction for the eye, transition zone (2) set up to one section arc structure, two sections arc structures or any one in the three section arc structures according to the different shapes of cornea part (21), transition part (22) and sclera part (23).

2. The scleral mirror of claim 1, wherein: diameter DIA of the end of the transition zone (2)_BFC＝9mm～13mm。

3. The scleral mirror of claim 1, wherein: when the cornea part (21), the transition part (22) and the sclera part (23) are all convex surfaces, or when the cornea part (21) and the transition part (22) are convex surfaces and the sclera part (23) is a tangent surface, the transition region (2) is a segment of arc structure, the segment of arc structure comprises a first arc line, and the curvature radius R of the starting end of the first arc line_BFC1＝R₁Wherein R is₁Is the radius of curvature of the cornea (10) at a position corresponding to the beginning of the first arc.

4. The scleral mirror of claim 3, wherein: diameter DIA of the end of said first arc_BFC1＝9mm～13mm。

5. The scleral mirror of claim 1, wherein: when the cornea part (21) and the sclera part (23) are convex surfaces and the transition part (22) is a tangent plane, the transition area (2) is of a two-section arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting end of the second arc line corresponds to the cornea, the starting end of the third arc line corresponds to the sclera, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂A radius of curvature of a location on the cornea (10) corresponding to the beginning of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃Is the radius of curvature of the sclera (30) at a location corresponding to the beginning of the third arc.

6. The scleral mirror of claim 1, wherein: when the cornea part (21) is convex and the transition part (22) and the sclera part (23) are tangent planes, the transition area (2) is of a two-segment arc structure; the two arc structures comprise a second arc line and a third arc line which are continuously formed from the center to the outside, the starting ends of the second arc line and the third arc line correspond to the cornea, and the curvature radius R of the starting end of the second arc line_BFC2＝R₂Wherein R is₂A radius of curvature of a location on the cornea (10) corresponding to the beginning of the second arc; radius of curvature R of the starting end of the third arc_BFC3＝R₃Wherein R is₃Is the radius of curvature of the cornea (10) at a position corresponding to the beginning of the third arc.

7. The scleral mirror according to claim 5 or 6, wherein: the second arcDiameter DIA of the end of the wire_BFC29mm to 11.5 mm; diameter DIA of the end tail of said third arc_BFC39.5mm to 13mm, and DIA_BFC3＞DIA_BFC2。

8. The scleral mirror of claim 1, wherein: when the cornea part (21) is a convex surface, the transition part (22) is a tangent plane and the sclera part (23) is a concave surface, the transition region (2) is a three-segment arc structure, the three-segment arc structure comprises a fourth arc line, a fifth arc line and a sixth arc line which are continuously formed from the center to the outside, the starting ends of the fourth arc line and the fifth arc line correspond to the position of the cornea, the starting end of the sixth arc line corresponds to the position of the sclera, and the radius of curvature R of the starting end of the fourth arc line_BFC4＝R₄Wherein R is₄The radius of curvature of the cornea (10) at a position corresponding to the start of the fourth arc; radius of curvature R of the starting end of the fifth arc_BFC5＝R₅Wherein R is₅The radius of curvature of the cornea (10) at a position corresponding to the start of the fifth arc; radius of curvature R of the starting end of the sixth arc_BFC6＝R₆Wherein R is₆Is the radius of curvature of the sclera (30) at a position corresponding to the start of the sixth arc.

9. The scleral mirror of claim 8, wherein: diameter DIA of the end of said fourth arc_BFC49 mm-10 mm; diameter DIA of the end of said fifth arc_BFC59.5 mm-11.5 mm; diameter DIA of the end of said sixth arc_BFC610mm to 13mm, and DIA_BFC6＞DIA_BFC5＞DIA_BFC4。

10. The scleral mirror of claim 1, wherein: radius of curvature R at the center of the inner surface of the optical zone (1)_BBC＝R_corneal-ozWherein R is_corneal-ozThe radius of curvature at the center of the cornea (10), the diameter oz of the tail end of the optical zone is 5 mm-9 mm; of said positioning zone (3)Radius of curvature R of the starting end_BAC＝R_scleral-ACWherein R is_scleral-ACIs the radius of curvature of the sclera (30) at a position corresponding to the beginning of the positioning region, the diameter DIA of the end of the positioning region_BAC＝12mm～17mm。